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Fig. A.1

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(a): Optical transmission, T(λ), obtained from Eq. 1. (b): Blaze function of the grating computed according to Eq. 2. (c): Mirror reflectivity for the (U, B, V, R, and I) bands (red dots) and complete quadratic interpolation (blue line). The CubeSpec range limits are indicated by the two dashed grey lines. (d): Quantum efficiency for the (U, B, V, R, and I) bands (red dots) and complete quadratic interpolation (blue line). The CubeSpec range limits are indicated by the two dashed grey lines.

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